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SUMMARY:Evolution of the tetrapod tympanic ear - Professor Jakob Christens
 en-Dalsgaard\, University of Southern Denmark
DTSTART:20161117T160000Z
DTEND:20161117T170000Z
UID:TALK68343@talks.cam.ac.uk
CONTACT:Maria Schacker
DESCRIPTION:Recent research has shown that a tympanic middle ear evolved i
 ndependently in the major vertebrate groups and thus represent independent
  experiments in terrestrial hearing. Furthermore\, the tympanic ear emerge
 d quite late in each group  –most likely in the Triassic\,  approximatel
 y 120 my after the origin of the tetrapods and approximately 70 my after t
 he first truly terrestrial tetrapods emerged. Based on biophysical and neu
 rophysiological experiments on recent lungfish\, amphibians\, snakes\, liz
 ards and alligators I will try to outline scenarios for the initial adapta
 tions of the middle ear to non-tympanic hearing and assess the selection p
 ressures later adapting the middle ear for tympanic hearing\, especially i
 n relation to sensitivity and directionality.  
LOCATION:Hodgkin Huxley Seminar Room\, Physiology Building\, Downing Site
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